package com.sky.interceptor;

import cn.hutool.http.HttpStatus;
import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 用户端请求拦截器
 *
 * @Author mr.zhang
 * Date 2025/5/27 16:00
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)){
            //当前拦截到的不是动态方法,直接放行
            return true;
        }

        //1.从请求头中获取令牌,并判断是否为空
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2.为空,响应401状态码
        if (token==null){
            response.setStatus(HttpStatus.HTTP_UNAUTHORIZED);
            return false;
        }
        try {
            //3.解析令牌,是否正确
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);

            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            BaseContext.setCurrentId(userId);
            return true;
        } catch (NumberFormatException e) {
            //4.不正确响应401状态码
            response.setStatus(HttpStatus.HTTP_UNAUTHORIZED);
            return false;
        }

    }



    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //清理缓存
        BaseContext.removeCurrentId();
    }
}
